Alright, let's work through 5431 times 1605 step by step
5431 × 1605 = 1605 × (5431)
+ 1605 × 1 that results in 1605
+ 1605 × 30 that equals 48150
+ 1605 × 400 producing 642000
+ 1605 × 5000 resulting in 8025000

= 8716755
